--- Why does the lake smell terrible?--- Because large quantities of water _________.
#101273
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
推荐题目
Teenagers       their health because they play computer games too much.
#104862
A
have damaged
B
are damaging
C
damaged
D
will damage
He is an excellent teacher,so he is ________.
#101793
A
high thought
B
high thought of
C
well thought of
D
good thought of
Ever since the financial crisis ________, many workers _______from their jobs.
#102508
A
broke out; were laid off
B
has broken out; were laid off
C
had broken out; had been laid off
D
broke out; have been laid off